3,000+ words minimum?!?

I’m on Lingvist free French and I crossed the 3,000 word minimum but I still get new words, is it a glitch? There are a lot of words that have been repeated as ‘new’ I had already learned them but they come back same sentence and all. Should I just keep studying?
I was going to invite a friend and get the month of unlimited, seeing as I’m in Iraq and I don’t have a means to subscribe.